Lennox 18J37 Limit Switch the Nordyne 632425R offers a

the Nordyne 632425R offers a direct drop-in solution for aging or fouled switches

this is an auxiliary switch designed for pilot duty and control signals

If the vacuum is sufficient but the SPNO contact remains open

which is the standard for Honeywell and Barber-Colman linkage kits

Unlike potential relays that sense CEMF

Lennox 18J37 Limit Switch the Nordyne 632425R offers aThe Lennox 18J37 Limit Switch is a critical safety component engineered for high performance thermal regulation in residential and light industrial furnaces. As a normally closed disc style limit control, this genuine OEM Lennox replacement part is specifically designed to prevent heat exchanger damage by interrupting the burner circuit if internal temperatures exceed safety thresholds. Featuring a yellow color coded sleeve for rapid field